Hydrometer



Dec. 14 1926. LS1-0.606

` F. O. V. HIERGESELL HYDROMETER Filed April 1, 1926 INVENTOR 0 cury,shot or Patented Dec. 14, 1926.

FRANK 0. V. HIERG-ESELL, 0F PHILADELIIHIA, PENNSYLVANIA HYDROMETER.

Application led April 1,

This invention relates to measuring and has special reference tohydrometers such as t are used for measuring the densities ofaqueoussolutions, oils and other liquids.

In the ordinary construction of hydrometers these instruments consist ofa cylin. drica-l float chamber having a reduced hollow stem at its upperend and a weight chamber at`its lower end containing merthe like, theweight chamber being connected to the' float by a constricted neck,which isl sealed off in case 'weighted hydrometers, so that the mercuryor shot cannot pass into the float chamber. The stem is provided with 'ascale having divisions of proper character for the density determinationdesired as is well understood by those skilled in the art. Suchinstruments have a number of defects among which may be mentioned thedanger of breakage due yto the constricted neck, and the ditliculty ofcleaning due also to this neck.

Other hydrometers have no separate Weight chamber, the ballast beingcarried in t-he float chamber but not sealed ott'v permanently and areliable to breakage on that account.

One important object of the invention is to provide an improvedhydrometer wherein thc constriction of the neck will be eliminated.

.A second important vobject of the invention is to provide a hydroineterwherein there is no constriction dividing the iloat chamber from theweight. .chamber but in which the weightV is permanently sealed oft'.L

A third important object of the invention is to provide an improvedhydrometer wherein the shape is'such that the center of gravity of theweight is in the axis of the instrument, a construction difficult toobtain with the constricted neck because of the liability of the bulbgetting out ot14 alinement when the neck is heated for sealing ott'during manufacture of the instrument.

A'fourth important object of the invention is to provide a hydrometerhaving an improved shape of such character as to ensure greaterstability and less oscillation during use. f

With the above and other objects in view. as will be hereinafterapparent, the invenof mercury through the lower 192s. serial No. 99,121x

general of certain novel deails of construction and combinations ofparts hereinafter fully described, illustrated tion consists in 1n theaccompanying dra-wings and specically claimed.

In the accompanying drawings like characters of reference'indlcate likeparts in the several views, and:

Figure 1 is a side elevation of a hydrometer constructed in accordancewith the invention.

Figure is Figure 1.

4Figure 3 is a vertical diametrical section part of the instrument.

In constructing the instrument there is providedea tube`of glass ofsuitable thickness, the glass being preferably thicker than thatcommonly used for these instruments. At one end this tube is drawn voutto forma hollow there is provided a main float portion 10 and a hollowstem 11 which latter has the dea section on the line 2 2 of siredgraduations 12. The lower end ofthe being of the same diameter as thetube which e forms the body 10.. Thus, the device has a cylindrical bodywhich merges smoothly and without constrlction into the conical weightchamber. In this chamber is placed the required. weight of shot, mercuryor the like.

It will be seen that this construction provides a weight chamber that ispermanently sealed off from the float chamber and that there is nofragile neck between the two ,to readily break or to prevent cleaning,the smooth exterior of the instrument being easy to access for acleaning cloth at all points. Moreover, the peculiar conical shape ofthe weight chamber enables it to be readily alined with the tube so thatthe center of gravity of the weight lies, in use, in the axial' stem andsealed at the top. rIhus Having thus described the invention, what A calbo 5 duced of the same diameter as the body and permanently fixed tosaid disk with the axis of the cone coincident with the axis of the body10 and stem, and" a Weight in'said cone.

In testimony whexleof I affix my signature.

FRANK O. V. HIERGESELL.

